WHEEL CYLINDERS

GENERAL INFORMATION

The piston boots are of the push-on type and prevent moisture from entering the wheel cylinder.

To perform service operations or inspections of the rear wheel brake cylinders. It will be necessary to remove the cylinders from the support plate and disassemble on the bench.

CAUTION: Wheel cylinders with cup expanders must have cup expanders after any service procedures (reconditioning or replacement).

SERVICE PROCEDURES

REMOVING WHEEL CYLINDERS FROM BRAKE SUPPORT PLATES

With brake drums removed, inspect the wheel cylinder boots for evidence of a brake fluid leak. Then block the brake pedal in the stroke position, and visually check the boots for cuts, tears, or heat cracks. If any of these conditions exist, the wheel cylinders should be completely cleaned, inspected and new parts installed. (A slight amount of fluid on the boot may not be a leak, but maybe preservative fluid used at assembly.)

(1)In case of a leak, remove brake shoes, (replace if soaked with grease or brake fluid.)

(2)Disconnect brake tube from wheel cylinder (Fig.

1).

(3)Remove the rear wheel cylinder attaching bolts (Fig. 1). Then pull wheel cylinder assembly off the brake support plate (Fig. 2).

DISASSEMBLING WHEEL CYLINDERS

To disassemble the wheel cylinders, (Fig. 3) proceed as follows:

(1)Pry boots away from cylinders and remove.

(2)Press IN on one piston to force out opposite piston, cup and spring (with cup expanders). Then using a soft tool such as a dowel rod, press out the cup and piston that remain in the wheel cylinder.

(3)Wash wheel cylinder, pistons, and spring in clean brake fluid or alcohol; (DO NOT USE ANY PETROLEUM BASE SOLVENTS) clean thoroughly and blow dry with compressed air. Inspect cylinder bore and piston for scoring and pitting. (Do not use a rag as lint from the rag will stick to bore surfaces.)

Fig. 1 Brake Tube Disconnected

Fig. 2 Remove or Install Wheel Cylinder